The build number for the Indian variant is I9500ODDFNB3 and the firmware build is dated Thu, 13 Feb 2014. The KitKat update adds wireless printing, support for emojis and lots more new features. The Android 4.4.2 KitKat update for the Galaxy S4 brings minor UI changes and under the hood improvements such as,

Status bar icons now in KitKat White from Green

Lockscreen Camera shortcut

New launcher settings [Homescreen, SMS]

Samsung Keyboard layout improved in landscape mode

Full screen music album art in the lockscreen

Improved user interface

Performance improvements

The Android 4.4 update for the Galaxy S4 (GT-I9500) is 353.59MB . It is available Over-the-Air (OTA) in India. You can try updating the phone using Kies software if it fails.